Voltage-regulator.



S. D. SPRONG & W. E. MUGUY. VOLTAGE REGULATOR. APPLICATION FILED OUT. a, 1908.

921 ,299, Patented May 11, 1909.

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SEVERN D. SPRONG AND WALTER 1C; MCCOY, OF NEW YORK, Y.

VOLTAGE-REGULATOR.

Specification of Letters Patent.

Patented May 1 1, 1909.

Application filed October 3, 1908. Serial No. 455,989.

To all whom it may concern:

Be it known that we, SEvnRN I). SPRONG and WALTER E. McCoy, citizens of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Voltage-Regulators, of which the following is a specification.

The invention 1s a device for regulating the. voltage on a circuit; and is more especially devised to obviate the usual lagging of contact making controlling apparatus behind the actual voltage changes, due to the inertia-of the parts and the gap between the contacts. The invention consists in the combination in a circuitvoltage regulator, of means for compensating for voltage variations, means governed by periodic reversal of its energizing field for controlling said compensating device, and means controlled by the voltage on saidcircuit for varying the relative duration of said reversals: also in thevarious combinations more particularly set forth in the claims.

The accompanying drawing is an electrical diagram.

1 and 2 are the conductors of the load circuit, between which the voltage may vary and so require regulation. The load may be glow lam s, as indicated at 3. In series with the oad is a variable rheostat 4, the pivoted contact arm 5 of which carries a curved rack 6, which engages with a worm 7 on the shaft of series motor 8, so that the arm 5 is moved to cut resistances into or out of circuit by the rotation of said motor 8 in one direction or the other. The field winding of motor 8 is divided into two unequal sections, the major section A having approximately two thirds of the total ampere turns, and the minor section B having the remaining one third of said turns. The coil in section A is wound in the opposite direction to the coil in section B.

10 and 11 are conductors leading from any source of direct'current supply. The conductor 10 connects with one terminal of the field winding. The other terminal of said winding connects with motor 8. A second motor 12 is connected across conductors 1O and 11. Both motors 8 and 12 connect to conductor 11.

On the shaft 13 of motor 12 is a cylinder 14 of metal, having its circumferential pew Now, the short circuiting o veloped in a plane, and hence, in the form of a parallelogram) divided diagonally into two parts, over one of which, 15, the metal is exposed while the other part, 16, is covered (a with insulating material.

17 is a pivotedbell crank lever, the extremity of one arm 18 of which makes contact with cylinder 14, the other arm 19 carries the core 20 of a solenoid 21, the terminals of which are connected to circuit conductors 1 and 2. The arm 18 which is insulated from the rest of the bell crank lever,

is, connected by wire 22 to the field winding motor 8, at a point between the sections A nd B of said winding. The cylinder 14 is insulated from the motor 12 and is connected to direct conductor 10 by wire 23.

Referring now more particularly to the cylinder 14, it will be obvious, that when the contact arm 18 is in. the intermediate position, shown in full lines in the drawing, theperiods during which the'circuit, which includes major section A of the motor field winding, will be opened and closed, per revolution of. said cylinder, will be equal. Or, in other words, the circuit will be opened half the time, and closed half the time. If the arm 18 be swung to the right, then the periods of make of circuit will increase and.

turns of minor section B, it is obvious, that if both sections of the winding are in circuit, one half of major section A will be neutralized by minor section'B, and hence, the remaining half of major section A will determine the directionof rotation of the motor 8. On the other hand, if major section A be short circuited, then only the'minor section B will control the motor and consequently cause its rotation in the opposite direction.

major section A depends u on whether the arm 18 is in contact with t e insulated or the uncovered portion of the peri hery of cylinder .14 while the time during which the short circuiting continues depends upon the position of said arm on said cylinder, Assume the normal COIldl- 

